Asebi Inoue (Ben-To) also known as Reaper, is the ultimate jinx, with luck so incredibly bad that she can actually infect other people with it just by touching them, and protective and lucky charms actually degrade in her presence or become unlucky charms.
Experiment 113 "Shoe" (Lilo & Stitch) causes bad luck when his horns are facing down.
The Glasses of Misfortune (Majimoji Rurumo) continually double the users bad luck until they either die or the glasses are removed.
Seina Yamada's (Tenchi Muyo) luck is so terrible, the Galaxy Police turned it into an anti-Space Pirate weapon.
Bubbles (Valkyrie Crusade) blows bubbles that can bring either good or bad fortune to whomever they pop on.